Controlling apparatus for electric motors.



H. C. MOSLEY.

CONTROLLING APPARATUS FOR ELECTRIC MOTORS.

APPLICATION FILED DEC. 30. 1915.

1,232,372. Patented July 3, 1917.

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H. C. MOSLEY. CONTROLLING APPARATUS FOR ELECTRIC MOTORS.

APPLICATION FILED DEC- 30. I915- Patented July 3, 1917.

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HARLEY C. MOSLEY, 01 PORTSMOUTH, OI-IIO, ASSIGNOR TO WHITAKER-GLESSNERCOM- PANY, OF WHEELING, VJEST VIRGINIA, A CORPORATION OF WEST VIRGINIA.

CONTROLLING APPARATUS FOR ELECTRIC MOTORS.

Specification of Letters Patent.

Patented July 3, 1917.

Driginal application filed March 1, 1915, Serial No. 11,317. Divided andthis application filed December 30,

T 0 all whom it may concern:

Be it known that I, HARLEY C. MOSLEY, a citizen of the United States ofAmerica, and resident of Portsmouth, county of Scioto, and State ofOhio, have invented certain new and useful Improvements in ControllingApparatus for Electric Motors, of which the following is aspecification.

This invention relates broadly to a controlling mechanism for electricmotors, and it has for its primary object to provide a device wherebyelectric motors may be auto matically rendered operative and inoperativeat predetermined related intervals.

A further object is to provide, in connection with an electric motor andmechanism which is to be actuated by said motor in a succession ofintermittent steps of regular or predetermined length, a system ofcontrol whereby said motor is automatically started and stopped atproperly timed instants.

For illustrative purposes only the device composing the presentinvention is herein shown and described in connection with thesheet-cooling apparatus described in my application for Letters Patentfiled March 1, 1915, Serial No. 11,317, of which this case is adivision.

In describing the invention in detail, ref erence is herein had to theaccompanying drawings, forming a part of this specification, in whichFigure 1 is a top plan view of the invention applied to thesheet-cooling apparatus mentioned Fig. 2 is a section on the line 22,Fig. 1;

Fig. 3 is a section on the line 33, Fig. showing a face view of the dialswitch; and

Fig. 4 is diagrammatic view of the invention.

Referring to said drawings, 1 indicates, generally, a bull-wheel of anordinary type employed in galvanizing plants in cooling sheets of metalas they come from the coating bath, said wheel consisting of a shaft 2having splined thereon a plurality of spaced hubs 3 which carry thereonor have integral therewith disks at in the periphery ,f each of whichare rigidly mounted the n ends of radially disposed fingers or quills Isaid fingers being located at equidistant .ater'vals said disks, and thefingers of the var-ions disks being disposed Serial No. 69,360.

in radial planes to constitute sheet rests or cradles. Said shaft 2 hasits ends suitably journaled on a supporting frame or housing 6 andcarries on one end thereof a gearwheel 7 disposed in operative relationto a worm 8 carri d by a worm-shaft 9 journaled on supports 10. Saidworm-shaft 9 has fixed thereon a gear 11 in mesh with a pin ion 12carried by a suitably journaled jaclc shaft 13 which also carries a gear14 in mesh with a pinion 15 fixed on the drive-shaft 16 of a suitablylocated motor 17.

Located directly in front of the bull-wheel 1 is a plurality of rollers18 arranged in parallel horizontal alinement so as to constitute asheet-receiving table to which sheets are delivered singly as they areadvanced from the coating point by means of an endless chain conveyer19, said conveyer being disposed parallel to the line of the axis ofsaid bull-wheel, and having its delivery end arranged adjacent to saidtable. Said rollers 18 have their outer ends j ournaled in a suitablebearing member, as the anglebar 20, mounted upon a frame 21, and havetheir inner ends journaled in brackets 22 disposed upon frame members23, said members and the rollers being separated to afford open spaces24c through which the fingers 5 may unobstructedly pass as thebull-wheel rotates, as is clearly illustrated in Fig. 1. Each roller 18carries a bevel gear 25 upon its outer end, said gears being disposed inoperative relation to bevel gears 26 carried by a suitably journaledline-shaft 27 which is driven by a constant running motor 28 through theintermediacy of a train of speedreducing gears, as a pinion 29 fixed onthe motor drive-shaft 30, which is in mesh with a gear 31 carried by ajaclcshar't which also carries a pinion 33 in mesh with a gear 34 fixedon said line-shaft.

In practice, the electric circuit to the wheel-driving motor 17 normallyremains open, maintaining said motor inoperative. However, each sheetdelivered to the sheetreceiving table automatically effects the closingof said electric circuit, setting said motor operation and actuatingsaid wheel to r0- tate until said circuit is again opened. The breakingor opening of said circuit is automatically accomplished atpredetermined intervals in the rotation of said wheel, said intervalsbeing regula ed y the tan e between adjacent rests or cradles providedon the wheel as aforesaid. The said circuit closing and opening meanswill now be described, particular reference being had to Fig. 4.

35 indicates a switch-board upon which is located a main-line switch 36whereby electric current may be conducted, as ordinari1y,.from main feedwires 37 for supplying a motor circuit and a motor-control circuit.Interposed in the motor-control circuit is a dial switch, designatedgenerally by the numeral 38, comprising a plate 39 of fiber or othersuitable non-conductive material mounted adjacent to the end of theworm-shaft 9 and having a pair of concentrically disposed copper ringcontacts 40 and 41 formed on the face thereof, one of said contacts, as41, having a short segment removed therefrom to form an open space 42.Carried by and insulated from said wornrshaft 9 is a copper arm 43 whichrests against said ring contacts 40 and 41 and forms a conductor throughwhich current travels between said contacts during the rotation of saidworm-shaft, eXcept when said arm is disposed across the open space 42,as shown in Fig. 3, in which position of said arm the motor circuit isbroken.

Located in the motor control circuit is the shunt coil 44 of a magneticswitch which is generally designated by the numeral 45; also aresistance unit 46, in series with said coil 44 is located in saidcircuit at a suitable point.

When the apparatus is rendered operative by the closing of the main-lineswitch 36, the motor control circuit is closed, said circuit comprisinga conductor 47 leading from one pole of said main switch to said coil44, a conductor 48 leading from said coil to ring contact 41, the arm43, ring contact 40, a conductor 49 leading from said contact 40 toresistance unit 46, and a conductor 50 leading from said resistance unitto the opposite pole of said main switch. The closing of said circuit asaforesaid is not, however, productive of any direct results, due to thefact that the resistance unit 46 offers such resistance to the passageof the current that magnetic switch 45, which is located in the motorcircuit is not actuated by its coil 44 to close. Vhen, however, a sheetof metal is delivered to the sheet-receiving table and is carried by theforwardly rotating rollers thereof to its most advanced position, itacts to close a shunt by means of which the resistance unit 46 may becutout,

or short circuited. Said shimt consists of conductors 51 and 52,respectively connected to conductors 48 and 50, and a makeand-breakswitch, the latter being desig nated generally by the numeral 53. Saidswitch 53 is located upon or adjacent to the rear end ofthesheet-receiving table in a position wherein a sheet 59, whendeposited on said table and occupying its most advanced position, willaccomplish the closing thereof; and it consists of an upright stationaryarm 54 bearing an insulated contact 55 and a pivoted arm 56 bearing aninsulated contact 57, said contacts 55 and 57 having said conductors 51and 52, respectively, connected thereto. Said pivoted arm 56 is normallyheld thrust forward, as by means of a suitably disposed spring 58, in aposition wherein its contact 57 is withdrawn from engagement with thecontact 55, thus maintaining the shunt open. When a sheet 59, depositedon the sheet-receiving table, as aforesaid, is carried forward on theconstantly rotating rollers 18, the fore most edge thereof strikesagainst the arm 56 of the spring switch 53 and swings said arm rearwardagainst the tension of the spring 58, carrying the contact 57 intoengagement with stationary contact 55, clos ing the shunt circuit anddiverting the current from the resistance unit 46. When the current isso diverted, the magnetic switch 45 is immediately closed, the coil 44of said switch actuating the armature 60 thereof to swing on its pivot61, carrying a contact 62 mounted thereon into engagement with a contact63 which is located in the conductor line 47. This action closes themotor circuit through an automatic motor starting device 64 of anordinary type, a conductor 65 leading from said contact 62 to saidstarter, a conductor 66 leading from said starter through a series field67 and commutating pole field 68 to the motor 17, and a conductor 69leading from said motor and connecting to conductor 50 which, in turn,is connected to one pole of the main line switch 36, as aforesaid.

'W-hen the motor 17 starts, actuated by the closing of the motorcircuit,the bull-wheel 1 instantly begins to rotate, actuated by saidmotor through the intermediate gearing hereinbefore described, and thesheet 59 on the receiving table is immediately lifted from said table bythe horizontally disposed row of fingers or quills which directlyunderlie said sheet. hen said sheet has been elevated to a point whereit no longer interferes with rearward movement of the pivoted arm 56,the latter is instantly actuated by its spring 58 to move rearward,breaking the shunt circuit. Thenceforth the coil 44 is supplied throughthe dial switch 38 and the resistance unit 46 with sutlicient current tomaintain the magnetic switch 45 closed, although, as hereinbeforeindicated, such current is insuflicient in strength to initially closesaid switch. Once started, the motor 17 continues to run until the arm43 carried by the worm-shaft 9 rotates to the open space 42 in ringcontact 41, whereupon the motor-control circuit through coil 44 ofmagnetic switch 45 is broken, resulting in the instantaneous opening ofthe last mentioned switch and the consequent breaking of the motorcircuit.

When the magnetic switch 45 is opened, as described, a pivoted contactmember of the butterfly type associated with the armature 60 thereof ismoved to a position connecting two separated contacts 71 and 72, theformer having a conductor 73 interposed between it and the conductor 47,and the latte* being connected by a conductor 74 to a similar contact 75 which is connected by means of a butterfly contact 7 6 to a contact 77which, in turn, is connected by a conductor 78 to the coil 7 9 of amagnetic switch 30 similar to the magnetic switch 45. Said coil 79 isconnected by a conductor 81 to a contact 2 provided on the armature 83of said switch 80, and said contact 82 is in turn connected by aconductor 84 to conductor 50. Thus, upon the opening of magnetic switch45, the magnetic switch is instantly energized and the armature 83 thereof swings forward on its pivot, carrying contact 82 into engagement witha fixed contact 85 which is connected by a conductor 86 to a resistancecoil 87 which, in turn, is connected by a conductor 88 to the con ductor66 between the series field 67 and the commutating pole field 68. At theinstant that the switch 80 closes, a resistance unit 92 in series withcoil 79 and disposed between conductors 74 and 78 cuts in for preventingsaid coil 79 from receiving such an amount of current as would result inits burning out.

By the closing of the switch 80, as aforesaid, a dynamic brake circuitis established by short-circuiting the armature of motor 17 and thecommutating pole field 68 through resistance bank 87, while shunt fields89, having one side connected by a conductor 90 to the conductor 47 andhaving its other side connected by a conductor 91 to the conductor 69,are excited by being permanently connected across the line. Thus,immediately upon the motor-control circuit through coil 44 of magneticswitch 45 being broken by the passage of the arm 43 to the open space 42of ring contact 41, as hereinbefore described, a dynamic braking forceis exerted which results in the motor being stopped and a resultantstoppage of the bull-wheel. And, as the arm 43 must at all times openthe motor-control circuit at the same point in the rotation of theworm-shaft 9, and as the braln'ng effect is precisely the same at eachoperation, or at each time the braking force is applied, the bull-wheelmust at all times stop in proper position, assuming of course that thefingers or quills 5 are properly spaced on said wheel.

When the next sheet is deposited upon the sheet-receiving table, themotor control circuit is closed through the spring-switch 53, and,through the consequent closing of the motor circuit, the motor 17 isagain started. The short circuit which includes said spring switch isagain broken when the said sheet is lifted from engagement with the arm57 of said switch, whereupon the motor-control circuit through the dialswitch 38 maintains the motor in operation, the arm 43 of the last namedswitch, in the interval during which spring switch 53 remained closed,having moved from the open space 42 into switch-closing relation to ringcontacts 40 and 41. As is apparent, the motor circuit remains closed,actuating the motor 17, until said arm 43 again rotates to said openspace 42, whereupon the dynamic brake is again applied in the mannerhereinbetore described.

As hereinbefore stated, the apparatus herein claimed is shown associatedwith a rotatable sheet cooling device only for purposes of illustration.As is obvious, this is but a single instance of many uses to which theapparatus is applicable.

hat is claimed is 1. A motor control apparatus, comprising incombination with a motor and main line wires, a normally open motorcircuit, and a normally closed control circuit, said control circuitincluding an electro-magnetic switch for closing the motor circuit,means for maintaining said motor circuit closed for a predeterminedperiod, means for limiting the energization of the electro-magneticswitch to a degree insufiicient to close the same but sutficient tomaintain the switch closed after once having been closed, and amechanical switch for cutting out the last mentioned means.

2. A motor control apparatus, comprising in combination with a motor andmain line wires, a normally open motor circuit, and a normally closedcontrol circuit, said control circuit including an electro-magneticswitch for closing the motor circuit, means for maintaining said motorcircuit closed for a predetermined period, a mechanical switch connectedto said control circuit, and means shunted across said control circuitfor limiting the energization of the electro-magnetic switch to aninoperative degree prior to the closing of said mechanical switch andfor maintaining the magnetic switch closed after it has been operated bythe mechanical switch.

3. A motor control apparatus, comprising in combination with a motor andmain line wires, a normally open motor circuit, and a normally closedcontrol circuit, said control circuit including an electro-magneticswitch for closing the motor circuit, means for maintaining said motorcircuit closed for a predetermined period, a mechanical switch connectedto said control circuit, and a resistance for limiting the energizationof the electro-magnetio switch to an inoperative degree prior to theclosing of said mechanical switch for cutting out said resistance topermit the actuation of said elect-ro-magnetic switch and for holdingthe latter closed when the mechanical switch is opened.

a. A motor control apparatus, comprising in combination with a motor andmain line wires, a normally open motor circuit,.a control circuit havinga normally closed portion, said closed portion including an electro-magnetic switch for closing the motor circuit, means for maintainingsaid motor circuit closed for a predetermined period, means for limitingthe energization of the electro1nagnetic switch, to a degreeinsufficient to close the same but sufiicient to maintain the switchclosed after having been s9 positioned, and a mechanical switchconnected to said control circuit and adapted when closed to cut out thelast mentioned means.

A motor control apparatus, comprising in combination with a motor andmain line wires, a normally open motor circuit, and acontrol circuit,said control circuit including an electro-magnetic switch for closingthe motor circuit, means for maintaining said motor circuit closed for apredetermined period, means connected in series with saidelectro-magnetic switch and said means for maintaining the controlcircuit closed for limiting the energization of the electro-magneticswitch to a degree insufiicient to close the samebut sufiicient tomaintain the switch closed after having been so positioned, and anormally open switch adapted to be mechanically actuated to cut out saidmeans for limiting the energization of the electromagnetic switch andclosing the latter.

6. A motor control apparatus comprising, in combination with a motor andmain line wires, a normally open motor circuit, electro-magnetic meansfor closing said circuit, a normally closed control circuit connectedwith said means and having a resistance element therein to prevent theenergization of the electro-magnetic means to such a degree as isrequired to initially close the latter and permit of sui'ficientenergization of said means to maintain the latter operative after oncehaving been moved to operative position, and means for moving theelectro-magnetic means to operative position.

7. A motor control apparatus comprising, in combination with a motor andmain line wires, a normally open motor circuit, a nor mally closedcontrol circuit, said control circuit including an electro-magnet-icswitch for closing the motor circuit, means for maintaining said motorcircuit closed for a predetermined period, a resistance for normallylimiting the energization of the electro-magnetic switch to aninoperative degree; a mechanlcal switch for cutting out the lastmentioned means, a braking circuit connected across said motor circuit,said braking circuit comprising a short circuit element for the motorarmature, and an electro-magnetic switch for closing said brakingcircuit.

8. A motor control apparatus comprising,

.in combination with a motor and main line tion, and a normally openshunt circuit in the control circuit adapted to be closed for shuntingthe resistance and permit of the i ull energization of saidelectro-magnetic means.

9. A motor control apparatus comprising, in combination with a motor andan element to be driven thereby, a normally open motor circuit, anormally open magnetic switch in said motor circuit and including anoperat ing coil, a control circuit in which said operating coil islocated, means adapted to be actuated for closing said control circuitfor energizing said operating coil to close said motor circuit, meansmaintaining said control circuit closed during a predetermined movementof said element and opening both circuits at a predetermined point insaid iiovement, and dynamic braking means actuated by the opening of themotor circuit for stopping the motor.

10. A motor control apparatus comprising, in combination with a motorand an element to be driven thereby, a normally open motor circuit, anormally open magnetic switchin said motor circuit and including anoperating coil, a control circuit in which said operating coil islocated, means adapted to be actuated for closing said control circuitfor energizing said operating coil to close said motor circuit, meansmaintaining said control circuit closed during a predetermined movementof said element and opening both circuits at a predetermined point insaid movement, and a dynamic brake circuit closed by the open ing of themotor circuit.

11. A motor control apparatus comprising, in combination with a motorand an element to be driven thereby, a normally open motor circuit, anormally open mag netic switch in said motor circuit and including anoperating coil, a control circuit in which said operating coil islocated, means adapted to be actuated for closing said control circuitfor energizing said operating coil to close said motor circuit, meansmaintaining said control circuit closed during a predetermined movementof said element and opening both circuits at a predetermined point insaid movement, a shunt circuit closed by the opening of said motorcircuit, said shunt circuit including an energizable element, and adynamic brake circuit established by the energizing of said energizableelement, said brake circuit including a resistance unit and the armatureof the motor.

12. A motor control apparatus comprising, in combination with a motorand main line wires, a normally open motor circuit, electro-magneticmeans for closing said circuit, a normally closed control circuitconnected with said means and having a resistance element therein toprevent the energizat'ion of the electro-magnetic means to such a degreeas is required to initially close the latter and permit of suflicientenergization of said means to maintain the latter operative after oncehaving been moved to operative position, and a normally open shuntcircuit in the control circuit including a spring-returned switchadapted to be closed for shunting the resistance to thereby permit ofthe full current passing to said electro-magnetic means.

13. A motor control apparatus comprising, in combination with a motorand an element to be driven thereby, a normally open motor circuit, anormally open magnetic switch in said motor circuit and including anoperating coil, a control circuit in which said operating coil islocated, means adapted to be actuated for closing said control circuitfor energizing said operating coil to close said motor circuit, a switchin said control circuitadapted to be closed by rotation of the motor andto maintain said control circuit closed during a definite movement ofsaid driven element, a resistance unit associated with the lastmentioned switch for maintaining the motor circuit closed after theinitial closing of the latter, said switch being automatically opened ata predetermined point in the movement of the driven element for breakingboth of said circuits, and dynamic motor-stopping means actuated by thebreaking of the motor circuit.

14. A motor control apparatus comprising, in combination with a motorand an element to be driven thereby, a normally open motor circuit, a no"mally open magnetic switch in said motor circuit and including anoperating coil, a control circuit in which said operating coil islocated, spring-returned means adapted to be actuated to temporarilyclose the control circuit whereby said operating coil is energized forclosing the motor circuit, a switch in said control circuit adapted tobe closed promptly upon the motor being started and to maintain saidcontrol circuit closed during a definite movement of the driven element,a resistance unit associated with said switch for maintaining thecontrol circuit and the motor circuit closed after the temporary closingmeans for the former is rendered inefiective, said switch beingautomatically opened at a predetermined point in said movement of thedriven element for breaking both of said circuits, and dynamicmotor-stopping means actuated by the breaking of the motor circuit.

15. A motor control apparatus comprising, in combination with a motorand an element to be driven thereby, a normally open motor circuit, anormally open magnetic switch in said motor circuit and including anoperating coil, a control circuit in which said operating coil islocated, means adapted to be actuated to temporarily close the controlcircuit whereby said operating coil is energized for closing the motorcircuit, a switch having ring contacts located in said control circuit,a rotatable arm driven by the motor and adapted to engage said contactspromptly upon the motor being started, a resistance unit associated withthe last mentioned switch and maintaining said coil energized while theswitch remains closed, one of said contacts being disengaged by said armat a pretermined point in the rotation of the latter for breaking bothof said circuits, and dynamic motor-stopping means actuated by thebreaking of the motor circuit.

In testimony whereof, I aflix my signature in presence of twosubscribing witnesses.

HARLEY C. MOSLEY. Witnesses G. C. MGCLURE, FREDERICK E. FIEGRA.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

